方法一:通过ViewController的属性presentingViewController判断当前页面是否是被present出的,来确定采用dismiss方法
- (void)backAction {
if (self.presentingViewController) {
[self dismissViewControllerAnimated:YES completion:nil];
} else {
[self.navigationController popViewControllerAnimated:YES];
}
}
方法二:通过NavgationController的属性topViewController判断当前页面是否是被push出的最上层页面,来确定采用pop方法
- (void)backAction {
if (self.navigationController.topViewController == self) {
[self.navigationController popViewControllerAnimated:YES];
} else {
[self dismissViewControllerAnimated:YES completion:nil];
}
}
方法三:通过NavgationController的属性viewcontrollers数组索引,来判断当前页面是否是被push过,来确定采用dismiss方法
- (void)backAction {
if ([self.navigationController.viewControllers.firstObject isEqual:self]) {//当前页面尚未被Push过
[self dismissViewControllerAnimated:YES completion:nil];
} else {
[self.navigationController popViewControllerAnimated:YES];
}
}
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